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    • 8. 发明申请
    • REMOVAL OF SURFACE DOPANTS FROM A SUBSTRATE
    • 从基板上去除表面掺杂物
    • US20090162996A1
    • 2009-06-25
    • US11963034
    • 2007-12-21
    • Kartik RamaswamyKenneth S. CollinsBiagio GalloHiroji HanawaMajeed A. FoadMartin A. HilkeneKartik SanthanamMatthew D. Scotney-Castle
    • Kartik RamaswamyKenneth S. CollinsBiagio GalloHiroji HanawaMajeed A. FoadMartin A. HilkeneKartik SanthanamMatthew D. Scotney-Castle
    • H01L21/263
    • H01L21/2254H01L21/2253
    • A method and apparatus for removing excess dopant from a doped substrate is provided. In one embodiment, a substrate is doped by surfaced deposition of dopant followed by formation of a capping layer and thermal diffusion drive-in. A reactive etchant mixture is provided to the process chamber, with optional plasma, to etch away the capping layer and form volatile compounds by reacting with excess dopant. In another embodiment, a substrate is doped by energetic implantation of dopant. A reactive gas mixture is provided to the process chamber, with optional plasma, to remove excess dopant adsorbed on the surface and high-concentration dopant near the surface by reacting with the dopant to form volatile compounds. The reactive gas mixture may be provided during thermal treatment, or it may be provided before or after at temperatures different from the thermal treatment temperature. The volatile compounds are removed. Substrates so treated do not form toxic compounds when stored or transported outside process equipment.
    • 提供了用于从掺杂衬底去除多余掺杂剂的方法和装置。 在一个实施例中,通过表面沉积掺杂剂掺杂衬底,然后形成覆盖层和热扩散驱入。 将反应性蚀刻剂混合物与任选的等离子体提供给处理室,以通过与多余的掺杂剂反应来蚀刻掉覆盖层并形成挥发性化合物。 在另一个实施例中,通过掺杂剂的高能注入来掺杂衬底。 通过与掺杂剂反应形成挥发性化合物,将具有任选等离子体的反应气体混合物提供给处理室,以除去吸附在表面上的多余掺杂物和表面附近的高浓度掺杂剂。 反应性气体混合物可以在热处理期间提供,或者可以在与热处理温度不同的温度之前或之后提供。 除去挥发性化合物。 如此处理的基材在储存或运输到工艺设备外时不会形成有毒化合物。